On the farm, sometimes, weeds will sprout out of cow patties. They are called "shitweeds". The term is also used for a person who is miserably disagreeable, an asshole or a jerk, but has a greater depth of meaning. It represents someone who is bad and worthless (like a weed) who was spawned by something equally worthless (like shit). A person who is a "shitweed" is similar to white trash, a low and base person raised by low and base people.
The immensely pleasurable act of taking a large shit and proceeding to go to bed directly after. The expanded anal sphincter, aka asshole, when combined with the normal force or the pushing up of the bed, provides a very sensual and pleasurable experience.
James Woods: I'm gonna shitsleep tonight.
Peter Griffin : What did ya have Mexican for lunch?
A taunt, combination of "shit is weak," made for hollerin at some asshole(s) pullin some weak ass bullshit; also for use during sporting events to diss the other team; can be used also when one has just been defeated, to further demean them and their weak ass beer chugging/video game playing/attempt at profundity.
1. Damn, UF just lost to FSU again, fuck yeah!...shitsweak!
2. Gary: "My poem begins, 'a flock of seagulls cawed with the setting sun'..."
Allison: "Shitsweak, shitsweak! Shit is WEAK!"